Is there a way to set a single value in an array property via reflection in c#?
My property is defined like this:
double[] Thresholds { get; set; }
For "normal" properties I use this code to set it via reflection:
PropertyInfo pi = myObject.GetType().GetProperty(nameOfPropertyToSet);
pi.SetValue(myObject, Convert.ChangeType(valueToSet, pi.PropertyType), null);
How would I have to change this code to set the value in an array property at an arbitrary position? Thanks!
BTW: I tried to use the index parameter, but that seems only to work for indexed properties, not properties that are arrays...
When you do:
obj.Thresholds[i] = value;
that is semantically equivalent to:
double[] tmp = obj.Thresholds;
tmp[i] = value;
which means you don't want a SetValue
at all; rather, you want to use GetValue
to obtain the array, and then mutate the array. If the type is known to be double[]
, then:
double[] arr = (double[]) pi.GetValue(myObject, null);
arr[i] = value;
otherwise perhaps the non-generic IList
approach (since arrays implement IList
):
IList arr = (IList) pi.GetValue(myObject, null);
arr[i] = value;
If it is a multi-dimensional array, you'll have to use Array
in place of IList
.